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CHAPTER 8 XML S ERIA LIZA TION
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Figure 8-6. Application to demonstrate serialization of inherited classes Listing 8-12. Serializing the Inherited Manager Class private void button1_Click(object sender, EventArgs e) { Manager manager = new Manager(); manager.EmployeeID = int.Parse(textBox1.Text); manager.FirstName = textBox2.Text; manager.LastName = textBox3.Text; manager.HomePhone = textBox4.Text; manager.Notes = textBox5.Text; manager.NoOfSubordinates = int.Parse(textBox6.Text); FileStream stream = new FileStream(Application.StartupPath + @"\employee.xml", FileMode.Create); XmlSerializer serializer = new XmlSerializer(typeof(Manager)); serializer.Serialize(stream, manager); stream.Close(); if (checkBox1.Checked) { Process.Start(Application.StartupPath + @"\employee.xml"); } }
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CHAPTER 8 XML S ERIA LIZATION
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The code is essentially the same as we have been using up until now, but it uses the Manager class instead of the Employee class. An instance of Manager is created, and all its properties are set. Then an instance of XmlSerializer is created by passing the Type information of the Manager class. Finally, the Manager instance is serialized by calling the Serialize() method of XmlSerializer. Figure 8-7 shows the resultant XML output.
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Figure 8-7. Serialized XML of the Manager class Notice how all the public properties from the Employee base class as well as the one from Manager are serialized. The code to deserialize the Manager class is very similar to the one we used previously. Listing 8-13 shows this code. Listing 8-13. Deserializing the Manager Class private void button2_Click(object sender, EventArgs e) { Manager manager; FileStream stream = new FileStream(Application.StartupPath + @"\employee.xml", FileMode.Open); XmlSerializer serializer = new XmlSerializer(typeof(Manager)); manager = (Manager)serializer.Deserialize(stream); stream.Close(); textBox1.Text = manager.EmployeeID.ToString(); textBox2.Text = manager.FirstName; textBox3.Text = manager.LastName; textBox4.Text = manager.HomePhone; textBox5.Text = manager.Notes; textBox6.Text = manager.NoOfSubordinates.ToString(); } The only difference in this code is that it uses Manager in the deserialization process instead of Employee.
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CHAPTER 8 XML S ERIA LIZA TION
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Customizing the Serialized XML
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The XmlSerializer class automatically uses the name of the public members as the names for the resultant XML elements. This is what is required in many cases. However, sometimes you may need to customize the serialized XML data to suit your needs. In the previous example illustrating the serialization of complex types, we got the XML document shown in Listing 8-14. Listing 8-14. Serialized XML Document Without Any Customization < xml version="1.0" > <Employee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <EmployeeID>1</EmployeeID> <FirstName>Nancy</FirstName> <LastName>Davolio</LastName> <HomePhone>(206) 555-9857</HomePhone> <Notes>includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International.</Notes> <Type>Permanent</Type> <Emails> <string>nancy@somedomain.com</string> <string>nancydavolio@somedomain.com</string> </Emails> <Address> <Street>Sagebrush</Street> <City>Novi</City> <State>MI </State> <Country>USA</Country> <PostalCode>48375</PostalCode> </Address> </Employee> However, what if you want the resultant XML structure to resemble Listing 8-15 Listing 8-15. Serialized XML After Customization < xml version="1.0" > <MyEmployee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" EmployeeCode="1"> <FName>Nancy</FName> <LName>Davolio</LName> <Remarks> includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International. </Remarks> <EmployeeType>Permanent Employee</EmployeeType>
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CHAPTER 8 XML S ERIA LIZATION
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<EmailAddresses> <Email>nancy@somedomain.com</Email> <Email>nancydavolio@somedomain.com</Email> </EmailAddresses> <Address> <Street>Sagebrush</Street> <City>Novi</City> <State>MI</State> <Country>USA</Country> <PostalCode>48375</PostalCode> </Address> </MyEmployee> Observe Listing 8-15 carefully. There are some significant changes: The root element of the document is <MyEmployee> and not <Employee>. The element names are totally different from the public property names. The employee ID is stored as the EmployeeCode attribute. The EmployeeType enumeration value is different from the actual enumeration item text. Email addresses are stored as <Email> elements and not as <string> elements. The HomePhone property value is not serialized even if it is a public member of the class. To achieve such customization, the System.Xml.Serialization namespace provides several attributes. You are required to decorate your classes, enumerations, and properties with these attributes to customize the way they are serialized. Listing 8-16 shows the Employee class and the EmployeeType enumeration after applying many of these attributes. Listing 8-16. Customizing Serialization by Using Attributes [XmlRoot(ElementName="MyEmployee")] public class Employee { private int intID; private string strFName; private string strLName; private string strHPhone; private string strNotes; private string[] strEmails; private EmployeeType enumType; private Address objAddress=new Address();
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